Valve stem for inner tubes



Sept. 9, 1941. e. w. BECKER VALVE STEM FOR INNER TUBES Original Filedoct. 11, 19:53

- Gtkomeg Patented Sept. 9, 1941 George W. Becker, Silver Lake, Ohio,assignor,

by mesne assignments, to The Dill Manufacturing Company, Cleveland,Ohio, a corporation of Ohio Original application October 11, 1933,Serial No. 693,114. Divided and this application July 3-1, 1937, SerialNo. 156,831

2 Claims.

This invention relates to inner tubes for pneumatic tire casings, andmore especially it relates tothe inner tubes provided with rubber valvestems. I r

The chief object of the invention is to provide an improved valve stemfor inner tubes of the character mentioned. More specifically theinvention aims to provide a tube construction in which the valve stemmay not readily be torn from the tube; which positively prevents leakageof air atthe connection between valve stem and tube; and to provide aflexiblerubber valve stem having a metal insert so arranged as toprevent distension of the rubber stem under pressure from within theinner tube.

This application is a division of my copending' application SerialNo.'693,114 filed October 11-, 1933, now Patent No. 2,120,346. v Of theaccompanying drawing:

Figure 1 is a side elevation of a rubber valve stem, in its preferredform, before it is incorporated in an inner tube; and g Figure 2 is afragmentary transverse section through a pneumatic tire and a rim inwhich it is mounted, there being an inner tube in the tire, iantgie animproved rubber valve stem in the inner Referring to the drawing, therubber valve stem 31 shown therein is provided with sufficient taper ordraft to permit easy removal from the mold in which it is made. At itsbase it is formed with an integral terminal flange 38 preferably ofrhombus or diamond shap'e, said flange having its marginal portiontapered or beveled substantially to a featheredge. At the juncture ofthe stem 31 and flange 38 is an annular shoulder or boss 43 that isconcentric with the stem minal flange 38 is a tubular metal insert 39for receiving the valve mechanism of the structure. The insert 39extends substantially the full length of the rubber stem, but terminatesjust short of the terminal flange 38 thereon. The arrangement is such asto enable the valve stem to flex as a whole from its. point ofattachment in an inner tube, the insert also preventing distension ofthe rubber stem by reason of the inflatio pressure within the tuber Asshown in Figure 2, an inner tube 34 is shown in inflated condition in atire casing 30 that is mounted upon a drop center rim 35 thathas a valvestem aperture 36 formed in one of the sidewalls of its centralperipheral well or groove.-

The valve stem 31 of the inner tubeis relatively short, and is disposedat an angle to the plane of the tube.

Preferably the interior surface :of the tube 34 is treated with acomposition is. that seals the pores in the rubber of the tube andprevents the seepage of air therethrough. Such a composition isdisclosed in the patent to Calvert, U. S. Patent No. 1,846,790.

Modiflcation'may be resorted to without departin'g from the spirit ofthe invention or the scope of theappended claims, which are not limitedwholly to the'speciflc construction shown or described. a p

What is claimed is:

1'. An inner tube comprising an endless tube and an integral rubbervalve stem, said rubber stem having a terminal base flange integrallyattached to the outside of said tube to provide a reinforced regionadjacent the valve stem, a tubular metalvalve insert in said stem forreceiving a valve mechanism wholly within said tubu-.

lar insert, said metal insert being permanently united in the rubberstem by being molded therein having its innermost end of generallycylindrical shape and terminating substantially flush withthe outersurface of said flange, whereby said stem, as a whole, is integrallyunited with said tube and relative flexing'between the stem and the tubeis substantially confined to the reinforced region at the base of thestem.

2. A combination inner tube and flexible rubber valve stem structure,said structure comprising a rubber valve stem having a base flangeformed thereon and integrally attached to the outside of said tube, atubular metal valve insert,

embedded in said rubber stem for receiving a valve mechanism whollywithin said tubular insert, said metal insert having its innermost endof generally cylindrical shape and terminating in said stem short ofsaid base flange but extending substantially to the adjacent inner tubesurface whereby the exposed portion of said stem is rigid and thejunction of the stem and inner tube in the region of said base flange isflexible, when positioned in a wheel assembly.

GEORGE W.

